INTENSITY-CONTROLLED NONRECIPROCAL COUPLER

Intensity-controlled nonreciprocal coupler is proposed and studied ana lytically and numerically. The structure consists of two planar wavegu ides - the dielectric waveguide and the asymmetric magnetooptic wavegu ide - coupled through a: nonlinear Ken-type medium. The operation of t he device utilises the nonreciprocal phase shift for TM modes in magne tooptic waveguide. The coupled mode equations are solved analytically in terms of Jacobian elliptic function. The transmission characteristi cs and the coupling efficiency for forward and backward direction prop agation have been analysed depending on the input power. The transmiss ion characteristics of the coupler are more sensitive to the input pow er for this direction propagation for that the linear propagation mism atch between the waveguides is larger Isolation of the device increase s with increasing input power.